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During infancy, the skull of a newborn is made up of several bones that have spaces between them. As the brain grows, of course the skull also grows with it and as the brain grows, the spaces close. At the stage of childhood is basically the growth stage and your bone grows around something called growth plates. At the end of adolescence is when the bones stop growing! The growth plates are the last portion of your bone to get hard and when it does the arms and legs stop growing and the skull plates fuse. Even when you stop growing, new and old bone go through a cycle that breaks down old bone and new bone is formed. As a person ages, more bone is broken down than is formed and this can lead to a decrease in bone mass, which also decreases bone density. Bones that are less dense may break more easily. Many doctors recommend that adults over a certain age get regular bone density tests.
Angel Nguyen 4-29-09 Period 1
The Skeletal System
You might think that bones are completely solid and made up of dead tissue but they are actually made up of both hard and soft materials. Like your heart or skin, bones are living tissue. Every bone is made up of two types of bone tissue: compact bone and spongy bone. The hard compact bone surrounds the soft spongy bone. Compact bone functions as the basic supportive tissue of your body, the part of the body you call the skeleton.The outer layer of the compact bone is very hard and tough and it covers the outside of most bones. Inside the bone, the calcium network is less dense and this tissue is called spongy bone. Spongy bone is strong but lightweight and it makes up most of the short, flat, and irregular bones found in your body. It also makes up the ends of long bones. Inside the spongy bone tissue we find marrow, the part os the bone that produces blood cells. The new blood cells travel from the marrow into the blood vessels that run throughout the bone.
A joint is a place at which two parts of the skeletal system meet. There are three types of joints: immovable, slightly movable, and freely movable. An immovable joint locks bones together like a puzzle piece. For instance, your skull. Slightly movable joints are able to flex slightly like your ribs connected to your sternum. Freely movable joints allow your body to bend and to move and are held together by tissues called ligaments. The entire joint also is surrounded by connective tissue. Plus, other structures inside the joint cushion the bones and keep them from rubbing together. Movable joints can be calssified by the type of movement they produce.
Joints connect parts of the skeletal system.
The skeleton changes as the body develops and ages.
Bones are living tissue.
cosgrovec added this comment 2009-05-04 18:36:56-05:00
nah its good
xx4everazngirlxx added this comment 2009-05-02 11:24:24-05:00
i think i should work on this a little more...
cosgrovec added this comment 2009-05-04 18:36:56-05:00
nah its good
xx4everazngirlxx added this comment 2009-05-02 11:24:24-05:00
i think i should work on this a little more...